This is a picture of Enceladus. Enceladus is a moon of Saturn. This picture was taken by the Cassini spacecraft in February 2005. Some parts of Enceladus have lots of huge cracks in them. This is one of those parts. Scientists are not quite sure what causes the cracks. Can you see one really big crack near the middle of this picture? That crack is 5 km (3 miles) wide! The cracks are mostly on the southern part of Enceladus. Image courtesy NASA/JPL/Space Science Institute.